To provide an inexpensive rain collector easy in installation.

This rain collector is characterized by having a frame body, a rain collecting body expandably and contractibly held in a frame and an opening-closing means for expanding the rain collecting body in a rain collecting state and contracting the rain collecting body in a retreat state. Thus, a structure is extremely simple, and since the rain collecting body can be opened-closed by the weather, risk of deteriorating a film in fine weather and damaging the rail collector in stormy weather can be avoided. Rainwater can also be efficiently and inexpensively collected by arranging the required area according to the purpose.